Lens bearer and lensometer incorporating the same

Abstract

The invention provides a lens bearer for bearing thereon a lens to be checked for an optical performance thereof. The lens bearer has a lens bearer body for bearing the lens thereon, and a covering member for being removably fitted on a lens-bearing portion of the lens bearer body, for placing the lens thereon. The covering member is made of a material which is softer than the lens bearer body. This makes it possible to replace the covering member alone when the lens bearer is used many times, thereby preventing deformation of a portion of the lens bearer which is brought into contact with lenses, and protecting the surface of the lens from being damaged.

What is claimed is: 
     
       1. A lens bearer on which a lens is placed for checking optical performance thereof, comprising: a lens bearer body having a lens-bearing portion for bearing said lens thereon, and   a coveting member which is removably fitted on said lens-bearing portion of said lens bearer body, said covering member being formed of a material which is softer and has a lower friction coefficient than said lens bearer body.   
     
     
       2. A lens bearer according to claim 1, wherein said covering member has a shape which covers at least an upper end surface of said lens bearer body. 
     
     
       3. A lensometer comprising: a lens bearer body having a lens-bearing portion for bearing a lens to be checked thereon,   a measuring optical system for causing a measuring light to be transmitted therethrough,   control means for converting light measured by said measuring optical system into an electric signal, and directing processing of said electric signal, and   a covering member for being removably fitted on said lens bearer body, said covering member being made of a material which is softer than said lens bearer body,   wherein said control means includes means for obtaining an optical performance on said lens in accordance with a placing level of said lens assumed when said covering member is fitted on said lens bearer body.   
     
     
       4. The lensometer of claim 3 wherein said control means includes correction means for correcting a measurement obtained on said lens, depending on whether said lens is placed at a level assumed when said covering member is fitted on said lens bearer body, or at a level assumed when said covering member is not fitted on said lens bearer body. 
     
     
       5. The lensometer of claim 3 wherein said covering member fits into an upper end surface of said lens bearer body.